Gold-catalyzed hydrofunctionalization of allenes with nitrogen and oxygen nucleophiles and its mechanistic insight
摘要:
A wide range of nucleophiles, such as amines and alcohols, reacted intermolecularly with various allenes in the presence of gold catalysts to give the corresponding hydrofunctionalization products in high yields. The intermolecular hydroamination of chiral allenes with aromatic and aliphatic amines proceeded with high to good enantioface selectivities to afford the corresponding chiral allylic amines. On the other hand, in the case of the intermolecular hydroalkoxylation of chiral allenes, no chirality transfer was observed. This marked contrast on the chirality transfer indicates that the mechanisms of gold-catalysis between hydroamination and hydroalkoxylation are different. (C) 2008 Published by Elsevier Ltd.
All rights reserved. First example of allylicether’s dimerization reaction was developed through olefin’s C–O bond insertion via Ag(I) catalysis. Other aromatic olefins, such as styrene and its electro-poor analogues could participate to provide the allylicether’s C–O bond insertion products.
Iridium-catalyzed reductive etherification of α,β-unsaturated ketones and aldehydes with alcohols
作者:Lu Ouyang、Yanping Xia、Rui Miao、Jianhua Liao、Renshi Luo
DOI:10.1039/d2ob00122e
日期:——
An iridium complex-catalyzed reductive etherification of α,β-unsaturatedketones and aldehydes with primary alcohols is presented, affording allyl ethers in excellent yields. Deuterated and control experiments showed that this etherification transformation proceeded through a cascade transfer hydrogenation and alcohol condensation process. Moreover, the utility of this protocol is evidenced by the